User interface for a display screen or portion thereof



FIG. 1 is a front view of a user interface for a display screen orportion thereof showing my new design.

FIG. 2 is a front view of a second embodiment thereof.

FIG. 3 is a front view of a third embodiment thereof.

FIG. 4 is a front view of a fourth embodiment thereof.

FIG. 5 is a front view of a fifth embodiment thereof; and,

FIG. 6 is a front view of a sixth embodiment thereof.

The broken line portion of the figure drawings is for illustrativepurposes only and forms no part of the claimed design.

CLAIM The ornamental design for a user interface for a display screen orportion thereof, as shown and described.